The last standing captive's name is unknown. Yet like Kassig, she was an aid worker in Syria, helping children who were orphaned or separated from their families as a result of the ongoing civil war.

The unnamed woman has been held by Islamic State militants since August 2013. Over the course of her captivity, US officials, along with her family, have remained firm in their request that her identity remain anonymous and out of the public's eye.

Executing a Western female captive on camera would be a first for Islamic State. She remained out of camera's view at the end of Sunday's video depicting the aftermath of Kassig's execution, marking a break from Islamic State's previous trend of showing their next intended victim on film. Their intentions for the female hostage remain unclear.

Islamic State has reportedly placed a $6 million ransom on the remaining hostage.

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